Dudek Krzysztof K, Iglesias Martínez Julio A, Ulliac Gwenn, Hirsinger Laurent, Wang Lianchao, Laude Vincent, Kadic Muamer
Institut FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25030 Besançon, France.
Institute of Physics, University of Zielona Gora, ul. Szafrana 4a, 65-069 Zielona, Gora, Poland.
Adv Mater. 2023 May;35(20):e2210993. doi: 10.1002/adma.202210993. Epub 2023 Apr 2.
The ability to significantly change the mechanical and wave propagation properties of a structure without rebuilding it is currently one of the main challenges in the field of mechanical metamaterials. This stems from the enormous appeal that such tunable behavior may offer from the perspective of applications ranging from biomedical to protective devices, particularly in the case of micro-scale systems. In this work, a novel micro-scale mechanical metamaterial is proposed that can undergo a transition from one type of configuration to another, with one configuration having a very negative Poisson's ratio, corresponding to strong auxeticity, and the other having a highly positive Poisson's ratio. The formation of phononic band gaps can also be controlled concurrently which can be very useful for the design of vibration dampers and sensors. Finally, it is experimentally shown that the reconfiguration process can be induced and controlled remotely through application of a magnetic field by using appropriately distributed magnetic inclusions.
在不重新构建结构的情况下显著改变其力学和波传播特性的能力，是目前机械超材料领域的主要挑战之一。这源于这种可调行为从生物医学到防护设备等一系列应用角度可能带来的巨大吸引力，特别是在微尺度系统中。在这项工作中，提出了一种新型微尺度机械超材料，它可以从一种构型转变为另一种构型，其中一种构型具有非常负的泊松比，对应于强拉胀性，另一种构型具有非常正的泊松比。同时，声子带隙的形成也可以得到控制，这对于振动阻尼器和传感器的设计非常有用。最后，实验表明，通过使用适当分布的磁性内含物施加磁场，可以远程诱导和控制重新构型过程。
